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What percentage of stars are larger and more massive than the sun?
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What causes some stars to be brighter than others?
In absolute terms larger (more massive) stars shine more brightly than less massive ones. In relative terms (as seen from Earth) more distant stars appear dimmer than closer ones.
Do the stars on the main sequence illustrate the mass-luminosity relationship?
Luminosity depends directly on mass because more massive main-sequence stars do not need to graviationally contract as far to reach fusion temperatures, and so they have a larger volume and contain a much larger amount of light energy, which diffuses out and generates a higher luminosity, very roughly in proportion to the higher volume.
Which star has shortest life?
The most massive stars have the shortest lives. All stars become massive when they reach a certain age, but the most massive stars begin their lives as Red Giants. See more at the article on Stars in Related links.
What do red dwarf stars come from?
They form the same way other stars form. Gas and dust in a nebular region collapse due to some sort of instability and coalesces onto a dense, spherical region which, upon receiving sufficient mass, starts nuclear fusion in its core. The star is now born. The major difference between red dwarfs and more massive stars is just that, mass. Red dwarfs has less mass to work with during their formation, and were thus left less massive than other stars. In truth, red dwarf stars represent the vast majority of stars in The Galaxy. Think of the larger, more massive stars, as "lucky to have a lot more mass than most other stars".
How the lifetime of stars depend on their mass?
The larger a star the shorter the lifetime because, larger stars burn out more quickly.
Is the color at the star related to its size?
Generally, yes. For stars on the main sequence, meaning that they fuse hydrogen at their cores, mass, size, color, brightness, and temperature are all closely related. More massive stars are larger, brighter and hotter than less massive ones. The least massive stars are red. As you go to more massive stars color changes to orange, then yellow, then white, and finally to blue for the most massive stars.
What causes some stars to be brighter than others?
In absolute terms larger (more massive) stars shine more brightly than less massive ones. In relative terms (as seen from Earth) more distant stars appear dimmer than closer ones.
Why do the largest stars with the greatest amount of hydrogen fuel in their cores burn out the quickest?
Larger stars, or to be more precise, more massive stars, have more gravity; therefore they get denser and hotter, therefore the nuclear reactions occur much faster. This is quite disproportionate; a massive stars may be, say, a hundred times more massive than a red dwarf, but burn fuel at a rate that is millions of times faster.
Why mass is so important in determining the evolution of a star?
Hydrogen, helium, and carbon fuel are found in more massive stars. The diameter of more massive stars is bigger. Helium is found in greater abundance in more massive stars. The weight of more massive stars is greater.
Do suns explode when they die?
Most do not. Stars about 10 times more massive than the sun or larger will explode. Smaller stars shed their outer layers gradually.
Are larger stars brighter but have a short lifespan?
Only if you "larger" you mean "more massive". The size (diameter) of a star may change quite a lot over its lifetime.
What forms massive stars?
Stars are made mostly from hydrogen. The more hydrogen available when a star is formed, the more massive it will be.
Are all-stars in the same galaxy?
No, there are more massive galaxies with stars in them.
Why have none of the stars from the big dipper ever fallen?
The stars are unimaginably far away, well beyond any influence from Earth. Even then, they are far larger and more massive than Earth is.
Do the stars on the main sequence illustrate the mass-luminosity relationship?
Luminosity depends directly on mass because more massive main-sequence stars do not need to graviationally contract as far to reach fusion temperatures, and so they have a larger volume and contain a much larger amount of light energy, which diffuses out and generates a higher luminosity, very roughly in proportion to the higher volume.
Does smaller mass stars have a greater luminosity than larger mass stars?
This is not necessarily true. most of the time stars with a larger diameter have more mass but some stars with a smaller diameter are more dense and have a greater mass. Find a main sequence star chart and you can compare the data.
Which star has shortest life?
The most massive stars have the shortest lives. All stars become massive when they reach a certain age, but the most massive stars begin their lives as Red Giants. See more at the article on Stars in Related links.
